<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
async_test(function(t) {
    var observer = new PerformanceObserver(function() {
        t.done();
    });
    gc();
    observer.observe({entryTypes: ['mark', 'measure']});
    window.performance.measure('measure_1');
}, 'Callback should be invoked after gc');
</script>
